US4425580A - Diagnostic x-ray installation for providing subtraction images - Google Patents

Diagnostic x-ray installation for providing subtraction images Download PDF

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Publication number
US4425580A
US4425580A US06/315,037 US31503781A US4425580A US 4425580 A US4425580 A US 4425580A US 31503781 A US31503781 A US 31503781A US 4425580 A US4425580 A US 4425580A
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Prior art keywords
image point
point data
image
difference
images
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US06/315,037
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English (en)
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Joerg Haendle
Wolfgang Maass
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Siemens AG
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Siemens AG
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Assigned to SIEMENS AKTIENGESELLSCHAFT, A GERMAN CORP. reassignment SIEMENS AKTIENGESELLSCHAFT, A GERMAN CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HAENDLE, JOERG, MAASS, WOLFGANG
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information
    • H04N5/32—Transforming X-rays
    • H04N5/3205—Transforming X-rays using subtraction imaging techniques
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Definitions

  • the invention relates to a diagnostic x-ray installation comprising a television pickup installation, image storage means, a difference stage for the subtraction of two chronologically successively obtained image signals through difference formation, and a monitor.
  • Subtraction images are required, in particular, in the case of angiography in order to make blood vessels clearly visible which can only be poorly recognized in the normal radiograph, or on which bone structures are superimposed.
  • radiographs which are prepared with contrast medium filling of the respective body region, are stored and subtracted from images which are taken without contrast medium filling.
  • a subtraction of two picture records can proceed by photographic or television-technical means.
  • the television-technical subtraction predominantly employed today, as storages for the images, either photographic documents which are scanned by television cameras or video image storages are employed.
  • the pictures In order that similar structures of the television pictures can be cancelled, the pictures must be subtracted in coincidence.
  • the coincident adjustment in the case of the known apparatus, proceeds by manual adjustment means which effect a displacement of the pictures relative to one another.
  • the operator By means of these adjustment means, the operator must correct the image registration through adjustment of the subtraction images and visual comparison on the monitor. This signifies an undesired additional outlay.
  • the invention proceeds from the object of producing an x-ray diagnostic installation of the type initially cited which unburdens the operator from routine tasks and effects, by electronic means, an automatic registration adjustment of two radiographs.
  • this object is achieved in that an address computer is connected with the output of the difference stage, whose outputs are connected to the address inputs of the image storage means, and which address computer alters in step-wise fashion the allocation of the image point data to be compared, respectively, in the difference stage, until a minimum of the difference formed during the subtraction of two images results.
  • an address computer is connected with the output of the difference stage, whose outputs are connected to the address inputs of the image storage means, and which address computer alters in step-wise fashion the allocation of the image point data to be compared, respectively, in the difference stage, until a minimum of the difference formed during the subtraction of two images results.
  • the address computer is so designed that first a variation of the allocation of the image point data in the horizontal direction is effected until a minimum difference results, and if, as the second step, the alteration is effected in the vertical direction.
  • a fluoroscopic subtraction can take place if the image storage means is comprised of an image storage having its output connected with one input of the difference stage and if the current video signal of the television pickup system is supplied to a second input of the difference stage.
  • a subtraction of two picture records can be achieved if the image storage means is comprised of two image storages which are connected with the difference stage.
  • FIG. 1 illustrates a block circuit diagram of a diagnostic x-ray installation
  • FIGS. 2 and 3 illustrate block circuit diagrams of the evaluation circuit according to FIG. 1.
  • FIG. 1 a diagnostic x-ray installation comprising an x-ray tube 2, fed by a high voltage generator 1, is illustrated, in whose ray path a patient 3 is disposed.
  • An x-ray image intensifier 4 following in the ray path, is connected with a television camera 5 whose output is supplied to an evaluation circuit 6.
  • the signal processed therein is displayed on a monitor 7.
  • a synchronous clock pulse generator 8 controls the synchronization of the chronological functional sequences of the television camera 5, the evaluation circuit 6 and the monitor 7.
  • A/D-converter 10 Supplied to the evaluation circuit 6 illustrated in FIG. 2 is the video signal of the television camera 5, which is separated into digital image points in an analog-to-digital converter (A/D-converter) 10.
  • the output of the A/D-converter 10 is connected with two image storage units 11 and 12 whose functions are controlled by the synchronous clock pulse generator 8.
  • the outputs of the image storage units 11 and 12 are connected with a difference stage 13 in which the stored video signals are subtracted from one another.
  • the difference signal is converted in a digital-to-analog converter (D/A-converter) 14 into analog video signals and is displayed on the monitor 7.
  • D/A-converter digital-to-analog converter
  • the output of the difference stage 13 is further connected to an address computer 15 whose outputs are connected with the address inputs of the image storage units 11 and 12.
  • the clock pulse rate of the synchronous clock pulse generator 8 is also supplied to the latter.
  • the address computer 15 effects an allocation of the image points of the stored images during the subtraction.
  • the address computer 15 determines the allocation of the image points in such a fashion that the two images are slightly horizontally offset. Also now it forms the sum of all differences and compares them with the preceding stored sum. If the preceding difference sum was greater than the newly computed sum, then it shifts the image further in this direction.
  • the first sum is smaller, then it shifts the images in the other horizontal direction. This proceeds until a minimum difference results. Subsequently, such a shift of the allocation of the image points also proceeds in the vertical direction, likewise until again a minimum difference results; i.e., the images now correspond so that they are in coincidence.
  • FIG. 3 a simplified design is illustrated which can be employed in the case of flouroscopy subtraction.
  • the two image storage units 11 and 12 in which successive image data with and without contrast medium filling are stored, only one image storage unit 11 is employed into which the image with contrast medium filling was read.
  • the difference stage 13 in addition to the video signal of the image storage 11, the output signal of the television camera 5, which has been converted in the A/D-converter 10, which output signal is obtained during an x-ray fluoroscopy.
  • the address computer 15 can be constructed as a microcomputer which, for example, is comprised of a microprocessor for calculating the sum of the signals delivered by the difference stage 13, for the comparison of the sum with the preceding sum and for the determination of the addresses for the image storage units 11 and 12, of a program memory, of data storage means for the intermediate storage of the values computed by the microprocessor, and of output registers for supplying the addresses determined by the microprocessor.
  • the photographic image storage means which are taekn by television cameras, mentioned at the outset, can be employed.
  • two picture records can here be synchronously scanned by one television camera each, whose output signals are supplied to the difference stage. A displacement of the allocation of the image points can proceed in that the video signals are shifted relative to one another.
  • only one television camera can be provided which reads the one picture record, as described in FIG. 3, into an electronic image storage, subsequently picks up the second picture record and directly supplies the video signals to the difference stage 13.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Medical Treatment And Welfare Office Work (AREA)
US06/315,037 1980-11-19 1981-10-26 Diagnostic x-ray installation for providing subtraction images Expired - Fee Related US4425580A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3043703 1980-11-19
DE3043703A DE3043703C2 (de) 1980-11-19 1980-11-19 Röntgendiagnostikeinrichtung zur Erstellung von Subtraktionsbildern

Publications (1)

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US4425580A true US4425580A (en) 1984-01-10

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US06/315,037 Expired - Fee Related US4425580A (en) 1980-11-19 1981-10-26 Diagnostic x-ray installation for providing subtraction images

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Country Link
US (1) US4425580A (fr)
JP (1) JPS57110235A (fr)
DE (1) DE3043703C2 (fr)
FR (1) FR2494531B1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468698A (en) * 1982-07-21 1984-08-28 General Electric Company Line-locked digital fluorography system
US4468696A (en) * 1982-07-21 1984-08-28 General Electric Company Line-locked digital fluorography system
US4503459A (en) * 1981-12-14 1985-03-05 Siemens Aktiengesellschaft X-Ray diagnostic installation for providing subtraction images
US4544949A (en) * 1982-03-05 1985-10-01 Tokyo Shibaura Denki Kabushiki Kaisha X-Ray diagnostic apparatus and method
US4581635A (en) * 1981-12-09 1986-04-08 Siemens Aktiengesellschaft X-ray diagnostic system for angiographic X-ray examination
US4591789A (en) * 1983-12-23 1986-05-27 General Electric Company Method for correcting image distortion due to gradient nonuniformity
US4825388A (en) * 1986-04-01 1989-04-25 Princeton Gamma Tech., Inc. Apparatus and method for processing digital images
US5005580A (en) * 1988-04-22 1991-04-09 Kabushiki Kaisha Toshiba Destroying wave treatment apparatus
US5647360A (en) * 1995-06-30 1997-07-15 Siemens Corporate Research, Inc. Digital subtraction angiography for 3D diagnostic imaging
US5690106A (en) * 1995-06-30 1997-11-25 Siemens Corporate Research, Inc. Flexible image registration for rotational angiography

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5822035A (ja) * 1981-07-29 1983-02-09 株式会社東芝 Ｘ線診断装置
NL8202450A (nl) * 1982-06-17 1984-01-16 Philips Nv Werkwijze en inrichting voor het verwerken van roentgenbeelden.
JPS5944244A (ja) * 1982-09-07 1984-03-12 株式会社東芝 Ｘ線診断装置
JPS5994045A (ja) * 1982-11-22 1984-05-30 Toshiba Corp 画像入力装置
JPS59151941A (ja) * 1983-02-16 1984-08-30 株式会社東芝 放射線診断装置
IL69327A (en) * 1983-07-26 1986-11-30 Elscint Ltd Automatic misregistration correction

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5942836B2 (ja) * 1978-07-24 1984-10-17 シチズン時計株式会社 アラ−ム時計の構造
JPS5853788B2 (ja) * 1979-03-19 1983-12-01 日本電信電話株式会社 印影照合処理方式
US4335427A (en) * 1980-04-21 1982-06-15 Technicare Corporation Method of selecting a preferred difference image

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Mistretta et al., "An Improved Technique for Enhancing Small Perodic Contrast Changes in Television Fluoroscopy", Optical Engineering, Sep./Oct. 1973, pp. 169-175.

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581635A (en) * 1981-12-09 1986-04-08 Siemens Aktiengesellschaft X-ray diagnostic system for angiographic X-ray examination
US4503459A (en) * 1981-12-14 1985-03-05 Siemens Aktiengesellschaft X-Ray diagnostic installation for providing subtraction images
US4544949A (en) * 1982-03-05 1985-10-01 Tokyo Shibaura Denki Kabushiki Kaisha X-Ray diagnostic apparatus and method
US4468698A (en) * 1982-07-21 1984-08-28 General Electric Company Line-locked digital fluorography system
US4468696A (en) * 1982-07-21 1984-08-28 General Electric Company Line-locked digital fluorography system
US4591789A (en) * 1983-12-23 1986-05-27 General Electric Company Method for correcting image distortion due to gradient nonuniformity
US4825388A (en) * 1986-04-01 1989-04-25 Princeton Gamma Tech., Inc. Apparatus and method for processing digital images
US5005580A (en) * 1988-04-22 1991-04-09 Kabushiki Kaisha Toshiba Destroying wave treatment apparatus
US5647360A (en) * 1995-06-30 1997-07-15 Siemens Corporate Research, Inc. Digital subtraction angiography for 3D diagnostic imaging
US5690106A (en) * 1995-06-30 1997-11-25 Siemens Corporate Research, Inc. Flexible image registration for rotational angiography

Also Published As

Publication number Publication date
DE3043703A1 (de) 1982-06-03
FR2494531A1 (fr) 1982-05-21
JPS57110235A (en) 1982-07-09
FR2494531B1 (fr) 1987-05-22
DE3043703C2 (de) 1983-01-20

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